Sound box



www?

A. Z. COATS `uly 10, 11923 SOUND BOX Filed OCL. ll, 1921 2 SheeS-Sheet 2 Patented July l, 19.23.

, "unirse TaTs misi ARIZONIA Z. COATS, F NEVIBERN, TENNESSEE, ASSIGNOR 0F ONE-HALF T0 ELMER HEADDEN, 0F NEWBERN, TENNESSEE.

SOUND BOX.

Application 1ed October 11, 1921. Serial No. 506,954.

To all whom if may concern Be it known that I, ARMONIA' Z. Cours, a citizen of the United States, residing at Newbern, in the county of Dyer and State of Tennessee, have invented certain new and useful Improvements in a Sound Box, of which the following is a specification.

This invention relates to sound boxes for phonographs and the primary object thereof is to provide a device which will amplify the sound without distorting the sound waves and which will eliminate the emission of scratchy and grinding sounds common to sound boxes of the diaphragm and reproducing needle type. y

Another object is to provide simple and efficient means to effect a duplication of the soundvibration produced by a single stylus or needle and to so 'encase the diaphragme that they are protected from the accumulation of dust there-on and consequent deadenin@ of the sound.

with these and other objects in view, the invention consists in certain novel features of contruction as hereinafter shown and described and then specifically pointed out in the claim, and in the drawings illustrative of the preferred embodiment of the invention.

In the accompanying drawings Figure 1 represents a side elevation of a tone arm equipped with this improved sound box.

Fig. 2 is an edge view or front elevation thereof with the tone arm broken off.

Fig. 3 is a central vertical section taken on the line 3-3 of Fig. 1.

Fig. 4 is a= side elevation of one section of the sound box taken from the inner face 4@ thereof with parts in section.

Fig. 5 is an enlarged transverse section taken on the line 55 of Fig. 1.

Fig. 6 is a side elevation taken from the inner face of one section of the sound box with the diaphragm removed.

Fig. 7 is a detail perspective view of the ring which is located between the diaphragms.

In the embodiment illustrated the sound 5o box 1 constituting this invention is composed of two sections 2 and 3 here shown circular in configuration although not necessarily so and which are provided at their meeting edges with apertured ears or lugs 4 those on one section registering with those on the other to receive the connecting bolts or `screws for uniting the sections. Any desired number of these lugs may be employed four being here shown. These sections. 2 and 3 are exactly alike being each provided on it-s inner face with a packing receiving groove 5 adjacent the perimeter These diaphragms 9 and 10 are held in spaced relation by a ring 11 composed' of any suitable metalfand provided on its opposed face with rubber rings l2 designed to contact with the opposed faces ofthe diaphragms and hold them in spaced relation and out of Contact with the metal. The sections 2 and 3 of the sound box are provided at their meeting edges at a point opposite the connections of the sound box with the tone arm with an opening 13 equipped with a collar 14 and in which is. designed to be mounted a needle holder 15. This needle i holder 15 is held pivotally mounted in the opening 13 by oppositely disposed set screws 16 as is shown clearly in Fig. 5.

The connection between the top of the needle holder or arm 15 and the two diaphragms whereby the vibratory movementof the needle produced by the record is transmitted to the diaphragme must be flexible and non-rigid, and also elastic to the extent of causing pulsations of the diaphragme, in response to the vibratory movements of the needle, without alternating the normal direction of such pulsation movements, that is to say in order that the diaphragm, caused to pulsate by vibrations imparted to it, shall have normal pulsating movement unrestrained by the characterof the connection employed to eifect the pulsations. For this purpose two flexible sound bars 17 and 18 are here shown connected at one end with the upper portion of the needle holder 15 and at their other end with the diaphragms 9 and 10 at their centers, said bars being shown parallel throughoutthe greater portion of their length. By emlwhieh telescopically engage they ends of the tubes Y and snugly fitted thereto being .collllelcteclx by screws or otherwise while the shank. or stemr22 is rotatively connectedwith-the .tone arm, said shank having a peripheral slot 23 vtherein for this` purpose through which extends a stud 24 carried by Lthe tone armas is shown clearly in Fig. l.

l-vFroin-,th-ej above-description it vwill be ob vious. that asound, boxl constructed as hereinafter shown and described having the two diaphi'agms connected with the needle .jholder receiying simultaneously the vibratigons therefrom will not only 4protect the diaphragme rfrom the accumulationof dustthereon andiithe deadening of the sound incident-tosuoh aecumulation but the sound from each diaphragm will be independently carried off through the tube 7, and mingled` inthe tone arm at a pointremote from the diaphragm, thus amplifying they sound without in any way distorting the lSound waves. This encasingr of the diaphragme in the sound box also entirely eliminates the emission of scratchy and grinding ysou-nds which are common to sound boxes of the diaphragm and reproducing needle type.

The preferred embodiment of the invention isdisclosed inthe drawings and set forth in the specification, but it will be understood that any modifica-tions within 'the scope of the claimed invention, may -bemade in the construction `without departing from the Vprinciple of the invention' or sacrificing any of its advantages vy n posed of a lcylindrical body thel ends. of which are equipped each with a sound con Veying tube said body being constructed of detachably connectedisect-ions, aI diail'ahrag,miy mounted in each ofvsaid sections, ay spacing ring ai'ia-iiged. between said .diaphragins,4

said ring being split and the ends thereof spaced apart, .a through the opening in said yring-.and engaged with.; said .diaphragins, and la needlev Anizonin Z.l oon'rs.

A sound box of the class described oointsound arm extending` 

